question_answer

The variation of refractive index of a crown glass thin prism with wavelength of the incident light is shown. Which of the following graphs is the correct one, if \[{{D}_{m}}\] is the angle of minimum deviation? [JEE Main 11-Jan-2019 Morning]

A)    

B)

C)              

D)

Correct Answer: A

Solution :

[a] The angle of minimum deviation In the given graph, as the wavelength increases decreases. Hence, the angle of minimum deviation also decreases.